3059046-01 - Pratt & Whitney OEM Teflon Lip Seal Plain 0.938 Shaft Diameter

3059046-01 – Pratt & Whitney OEM Teflon Lip Seal Plain

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Overview

The Pratt & Whitney 3059046-01 is a flight-critical, OEM Teflon lip seal, an essential dynamic sealing component for the accessory gearbox of the legendary Pratt & Whitney Canada (P&WC) PT6A turboprop engine. This is not a simple O-ring; it is a high-performance, precision-engineered seal designed to prevent oil leakage around a high-speed rotating shaft. The 3059046-01 features a lip made from a specialized, low-friction Polytetrafluoroethylene (PTFE) material, commonly known as Teflon®, held in a durable metal case.

Its function is to create a positive, dynamic seal that can withstand the extreme surface speeds, high temperatures, and chemical environment of the engine's lubrication system. As a genuine P&WC part, its integrity is fundamental to preventing oil leaks and ensuring the long-term reliability of the engine.

Key Features

• Dynamic High-Speed Sealing: Specifically designed as a rotary shaft seal. The flexible PTFE lip is engineered to maintain continuous, light-pressure contact with a rotating shaft (0.938" diameter), providing an effective seal at the thousands of RPM experienced in the accessory gearbox.

• Low-Friction PTFE Material: The sealing lip is fabricated from a specialized, filled PTFE compound. This material offers an extremely low coefficient of friction, which minimizes heat generation and wear on both the seal and the engine shaft, ensuring a long service life.

• Superior Fluid & Temperature Compatibility: The PTFE material is chemically inert and impervious to synthetic turbine oils (MIL-PRF-23699) and the high temperatures found within the engine's core. It will not harden, crack, or degrade like a standard elastomeric seal.

• Spring-Energized Design: The PTFE lip is typically energized by a small, garter-like metal spring. This spring provides a consistent radial force, ensuring the lip remains in constant contact with the shaft, compensating for minor shaft runout, thermal expansion, and wear.

• Genuine P&WC OEM Part: As a genuine factory component, it guarantees the correct material composition, precise lip geometry, and spring tension required for a reliable, long-lasting, leak-proof seal in a flight-critical application.

Technical Specifications

• Part Number: 3059046-01

• Component Type: Dynamic Rotary Lip Seal

• OEM Manufacturer: Pratt & Whitney Canada (P&WC)

• Sealing Lip Material: Polytetrafluoroethylene (PTFE / Teflon®)

• Case Material: Stainless Steel or other corrosion-resistant alloy.

• Energizer: Metal Spring

• Shaft Diameter: 0.938 inches

• Primary Function: Prevents oil leakage from a rotating shaft in the accessory gearbox.

• Certification: FAA / TCCA Production Approval

Aircraft Compatibility

The 3059046-01 is a critical internal seal used in a wide range of the ubiquitous Pratt & Whitney Canada PT6A engines, which power a vast number of aircraft.

• Primary Engine Models:

  • Pratt & Whitney Canada PT6A Series (numerous variants)

• Common Aircraft Platforms:

  • Textron Aviation: King Air, Caravan

  • Pilatus: PC-12

  • Daher: TBM Series

  • De Havilland Canada: DHC-6 Twin Otter

Why Choose 3059046-01?

An oil leak from a high-speed shaft seal on a turbine engine can have serious consequences, from gradual oil loss to a significant in-flight fire hazard if the oil contacts a hot surface. The Pratt & Whitney 3059046-01 is the only seal certified by the engine manufacturer to perform reliably in this extreme environment. Using a genuine OEM part is the only way to ensure the seal has the correct, advanced materials and precise engineering required to prevent leaks. For a component this vital to engine health and safety, there is no substitute.

The Pratt & Whitney 3059046-01 is a spring-energized PTFE lip seal, an advanced sealing solution for high-speed rotary applications. Unlike a standard elastomeric (rubber) lip seal that can degrade and lose its elasticity at high temperatures, a PTFE seal remains stable. The spring energizer is a critical component. The PTFE material itself, while durable, is not highly elastic. The garter spring provides a continuous, uniform radial load that presses the PTFE lip against the shaft. This ensures a consistent seal even with temperature fluctuations that cause the shaft and housing to expand and contract at different rates. The low-friction PTFE lip generates significantly less heat than a rubber seal at the high surface speeds of a turbine engine shaft, preventing the localized oil coking that can lead to seal failure.

Note: This is a flight-critical engine internal component. Installation must be performed by a certified AME or A&P mechanic at a qualified engine overhaul or repair facility in strict accordance with the current Pratt & Whitney Canada maintenance and overhaul manuals. Specialized tools are required for installation to prevent damage to the delicate sealing lip.
Cessna Aircraft Service Bulletin [ Click Here ]
Alternate Part Numbers: No known alternate

Product Overview

A deformable material that prevents the passage of matter through the joint formed when two faces are joined. It may be metallic or nonmetallic, lubricated or impregnated, solid or hollow cross-section. It may be made to any predetermined dimension and shape. Excludes flat disks, items made of felt material, and items having joints. For round metal and plastic items with an aperture and a solid rectangular cross-section, see washer, flat; shim; bearing, washer, thrust; and spacer ring. Excludes disk, valve; seal, nonmetallic angle; seal, nonmetallic channel; seal, nonmetallic special shaped section; shielding gasket, electronic; and ring, sealing jar.

Item Specification